# -*- coding: utf-8 -*-
# @Time:2021/04/10 21:56
# @Author:Cindy


class Calculator:

    def add(self, a, b):
        return a + b

    def sub(self, a, b):
        return a - b

    def mul(self, a, b):
        return a * b

    def div(self, a, b):
        return a / b
